* guix/import/crate.scm (crate-package?, latest-release,
  %crate-updater): New variables.
* guix/scripts/refresh.scm (%updaters): Add %crate-updater to list of
  updaters.
* guix/upstream.scm (package-update): Use a url from the list when the
  find2 procedure doesn't find a url sig-url pair.
---
 guix/import/crate.scm    | 36 +++++++++++++++++++++++++++++++++++-
 guix/scripts/refresh.scm |  4 +++-
 guix/upstream.scm        |  2 +-
 3 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/guix/import/crate.scm b/guix/import/crate.scm
index 3cc17f2..5b34330 100644
--- a/guix/import/crate.scm
+++ b/guix/import/crate.scm
@@ -28,7 +28,8 @@
   #:use-module (json)
   #:use-module (srfi srfi-1)
   #:export (crate->guix-package
-            guix-package->crate-name))
+            guix-package->crate-name
+            %crate-updater))
 
 (define (crate-fetch name)
   "Return an alist representation of the crates.io metadata for the package 
NAME,
@@ -89,3 +90,36 @@ VERSION, SOURCE-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and 
LICENSE."
 
 (define (crate-name->package-name name)
   (string-append "rust-" name))
+
+(define (crate-package? package)
+  "Return true if PACKAGE is a Rust crate from crates.io."
+
+  (define (crate-url? url)
+    (string-prefix? "https://crates.io/"; url))
+
+  (let ((source-url (and=> (package-source package) origin-uri))
+        (fetch-method (and=> (package-source package) origin-method)))
+    (and (eq? fetch-method download:url-fetch)
+         (match source-url
+           ((? string?)
+            (crate-url? source-url))
+           ((source-url ...)
+            (any crate-url? source-url))))))
+
+(define (latest-release package)
+  "Return an <upstream-source> for the latest release of PACKAGE."
+  (let* ((crate-name (guix-package->crate-name package))
+         (metadata (crate-fetch crate-name))
+         (version (assoc-ref* metadata "crate" "max_version"))
+         (url (crate-uri crate-name version)))
+    (upstream-source
+     (package (package-name package))
+     (version version)
+     (urls (list url)))))
+
+(define %crate-updater
+  (upstream-updater
+   (name 'crates)
+   (description "Updater for crates.io packages")
+   (pred crate-package?)
+   (latest latest-release)))
diff --git a/guix/scripts/refresh.scm b/guix/scripts/refresh.scm
index b00ac98..3cd5223 100644
--- a/guix/scripts/refresh.scm
+++ b/guix/scripts/refresh.scm
@@ -38,6 +38,7 @@
                           %xorg-updater))
   #:use-module (guix import elpa)
   #:use-module (guix import cran)
+  #:use-module (guix import crate)
   #:use-module (guix import hackage)
   #:use-module (guix gnupg)
   #:use-module (gnu packages)
@@ -206,7 +207,8 @@ unavailable optional dependencies such as Guile-JSON."
                  %hackage-updater
                  ((guix import pypi) => %pypi-updater)
                  ((guix import gem) => %gem-updater)
-                 ((guix import github) => %github-updater)))
+                 ((guix import github) => %github-updater)
+                 ((guix import crate) => %crate-updater)))
 
 (define (lookup-updater name)
   "Return the updater called NAME."
diff --git a/guix/upstream.scm b/guix/upstream.scm
index 1815737..ac3f72f 100644
--- a/guix/upstream.scm
+++ b/guix/upstream.scm
@@ -194,7 +194,7 @@ and 'interactive' (default)."
                              (string-suffix? archive-type url))
                            urls
                            (or signature-urls (circular-list #f)))))
-       (let ((tarball (download-tarball store url signature-url
+       (let ((tarball (download-tarball store (if url url (car urls)) 
signature-url
                                         #:key-download key-download)))
          (values version tarball))))
     (#f
-- 
2.9.0

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